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It is observed that simple organisms lik...

It is observed that simple organisms like algae and fungi normally reproduce asexually but before the onset of adverse conditions they shift to sexual reprodction, It is so because sexual reproduction

A

saves time

B

is rapid

C

produces variations

D

all of these

Text Solution

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The correct Answer is:
C
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Why do algae and fungi shift to sexual mode of reproduction just before the onset of adverse conditions?

Fill in the blanks: (1) The. .. . . A .. . . Reproduction is the common mode of reproduction in organisms that have a relatively simple organisation like algae and fungi and they shift to . . . .. . B. . . Method of reproduction just before the onset of adverse conditions. (2) Asexual (Vegetative) as well as sexual modes of reproduction are exhibited by the . . ... ..c . . . . . (3) Only sexual mode of reproduction is present in most of the . .. .. . ..d. .... . . .

Assertion : Algae and fungi switch to asexual method of reproduction before the onset of adverse conditions. Reason : Asexual reproduction may introduce variations and leads to the formation of many clones.

(A) Why do organisms like algae and fungi shift from asexual mode of reproduction to sexual mode ? (b) What is a juvenile phase in organisms ?

Offspring formed by asexual method of reproduction have greater similarity among themselves because (i) Asexual reproduction involves only one parent (ii) Asexual reproduction does not involve gametes (iii) Asexual reproduction occurs before sexual reproduction (iv) Asexual reproduction occurs after sexual reproduction

Consider the following statement with respect to reproduction in the lower living organisms A. Organismis like yeast and Planaria reproduce asexually by means of budding B. True regeneration is observed in Hydra C. The protonema of mosses multiply by fragmentation D. In the unicellular organisms like bacteria algae and Amoeba, reproduction is synonymous with growth i.e increase in number of cells

Choose correct option for asexual and sexual reproduction in organisms that have a relatively simple organisation.

Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?

Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival - the one reproducing asexually or the one reproducing sexually ? Give reason to justify your answer.

Read the following statements. (a) Algae are primary producers of energy rich compounds. (b) Marine algae are producers of hydrocolloids. (c) Stipe which is the leaf like photosynthetic organ is found in Ectocarpus . (d) Chlamydomonas shows only isogamous type of sexual reproduction. (e) Atlantic Ocean's sargasso was named after one of the brown algae. Select the correct option:

VMC MODULES ENGLISH-ANATOMY OF FLOWERING PLANTS -IMPECCABLE
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